package com.xmutca.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.sctp.nio.NioSctpChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;

public class HelloServer {

    public static void main(String[] args) {
        // 1. 启动器，负责组装 netty 组件，启动服务
        new ServerBootstrap()
            //2. BossEventLoop ,WorkerEventLoop(selector,thread) ,group 组
            .group(new NioEventLoopGroup())
            //3. 选择 服务器的 ServerSocketChannel 实现
            .channel(NioServerSocketChannel.class)// OIO BIO
            //4. boss 负责出来连接 worker(child) 负责处理读写， 决定了 worker(child) 能执行那些操作（handler）
            .childHandler(
                //5. 代表和客户端进行数据读写的通道 Initializer 初始化，负责添加别的 handler
                new ChannelInitializer<NioSocketChannel>() {
                    @Override
                    protected void initChannel(NioSocketChannel ch) throws Exception {
                        // 6. 添加具体 handler
                        ch.pipeline().addLast(new StringDecoder())//将 ByteBuf 转换为字符串
                            .addLast(new ChannelInboundHandlerAdapter() {//自定义 handler
                                @Override// 读事件
                                public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                                    // 打印上一步转换好的字符串
                                    System.out.println(msg);
                                }
                            });
                    }
                })
            //7.绑定监听端口
            .bind(8080);
    }
}
